* [binutils-gdb] Fix -Wmaybe-uninitialized warning in opcodes/i386-dis.c
@ 2023-04-21 15:11 Tom Tromey
0 siblings, 0 replies; only message in thread
From: Tom Tromey @ 2023-04-21 15:11 UTC (permalink / raw)
To: bfd-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=da9a978aae78e2c1e35ccdf683474847e4465e5f
commit da9a978aae78e2c1e35ccdf683474847e4465e5f
Author: Tom Tromey <tromey@adacore.com>
Date: Fri Apr 21 07:05:53 2023 -0600
Fix -Wmaybe-uninitialized warning in opcodes/i386-dis.c
A recent change in opcodes/i386-dis.c caused a build failure on my
x86-64 Fedora 36 system, which uses:
$ gcc --version
gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4)
[...]
The error is:
../../binutils-gdb/opcodes/i386-dis.c: In function ‘OP_J’:
../../binutils-gdb/opcodes/i386-dis.c:12705:22: error: ‘val’ may be used uninitialized [-Werror=maybe-uninitialized]
12705 | disp = val & 0x8000 ? val - 0x10000 : val;
| ~~~~^~~~~~~~
This patch fixes the warning.
opcodes/ChangeLog
2023-04-21 Tom Tromey <tromey@adacore.com>
* i386-dis.c (OP_J): Check result of get16.
Diff:
---
opcodes/ChangeLog | 4 ++++
opcodes/i386-dis.c | 3 ++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index d0c338a0f6d..890931e6b8a 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,7 @@
+2023-04-21 Tom Tromey <tromey@adacore.com>
+
+ * i386-dis.c (OP_J): Check result of get16.
+
2023-04-12 Claudiu Zissulescu <claziss@synopsys.com>
* arc-tbl.h: Remove vadds2, vadds2h, vadds4h, vaddsubs,
diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c
index 46ba01fe093..f021bdaa3e7 100644
--- a/opcodes/i386-dis.c
+++ b/opcodes/i386-dis.c
@@ -12701,7 +12701,8 @@ OP_J (instr_info *ins, int bytemode, int sizeflag)
{
int val;
- get16 (ins, &val);
+ if (!get16 (ins, &val))
+ return false;
disp = val & 0x8000 ? val - 0x10000 : val;
/* In 16bit mode, address is wrapped around at 64k within
the same segment. Otherwise, a data16 prefix on a jump
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